EP3659834A2 - Storage device for an air compressor of a vehicle - Google Patents

Abstract

The invention relates to a bearing device (76) for an air compressor (20) of a vehicle, by means of which the air compressor is connected to a body (44) of a vehicle in a vibration-isolating manner. It is proposed that the bearing device (76) have at least one air spring (48) an elastic air bellows (58), the bearing device (76) being arranged between the air compressor (20) and the body (44) and the air bellows (58) being connected to a compressed air line of the air compressor (20) for filling compressed air The invention relates to an air compressor (20) of a vehicle, which is connected to a body (44) of the vehicle in a pneumatically adjustable, vibration-isolating manner via a bearing device (76).

Description

The present invention relates to a bearing device of an air compressor of a vehicle, by means of which the air compressor is connected to a body of the vehicle in a vibration-isolating manner.

STATE OF THE ART

An air compressor in a vehicle is used to provide compressed air for a variety of pneumatic tasks. In higher-quality passenger cars and trucks in particular, wheel suspensions are equipped with pneumatic wheel springs, which are also referred to as air springs, in order to set a different spring characteristic depending on the driving situation and the desired vehicle behavior.

As a rule, such air compressors are connected to the body at one point of the vehicle in order to minimize the operating noises and vibrations which occur when the compressor is in operation with respect to the passenger compartment. However, it has so far not been possible to achieve a completely silent and low-vibration arrangement of the compressor in the vehicle.

In order to reduce dynamic force transmissions and / or vibrations that are generated by an air compressor during operation, decoupling devices for the air compressor of a vehicle are therefore necessary, one or more such decoupling devices being arranged between a body of the vehicle and the air compressor. The decoupling devices have the task of isolating or damping natural vibrations of the air compressor from a body in such a way that structure-borne sound propagation of the air compressor is largely suppressed. The decoupling device transfers as few dynamic forces as possible that are generated by the air compressor during operation into the body. On the other hand, shocks and vibrations of the body are isolated from the air compressor or only passed on to it in a dampened manner, so that is exposed to reduced external shock loads and can therefore achieve a longer service life.

For example, bearing devices with spiral springs are known from the prior art as decoupling devices, and a high degree of decoupling of the compressor from the vehicle can be achieved via the spiral springs with a low spring stiffness.

In the known device, the problem arises that the air compressor constantly encounters limiting elements during travel or the decoupling or spring device transmits shocks and vibrations, so that the working noises in the body are acoustically noticeable and noise is thus generated. In addition, it is impossible for different reduction effects of the dynamic power transmission to be achieved, in particular during operation of the air compressor, depending on the vibration level of the air compressor, in order to enable better decoupling. Ultimately, an undesirable resonance behavior of the decoupling device can result at certain speeds of the air compressor, which leads to increased noise.

For example, from the DE 10 2006 025 055 A1 describes a multi-directional vibration decoupling for decoupling vibrations, wherein the vibration decoupling can be used for suspending vibration-generating machines, such as motors on a surface, for example a vehicle chassis. The bearing is based on the principle of an air spring. This vibration decoupling comprises a rubber body in which compressed air is enclosed. This ensures that the vibration decoupling is as equally effective as possible in all directions and can be subjected to the same load in all directions. Furthermore, the vibration decoupling comprises a ring on which a groove is attached, with which different variants of connectors can be clicked in.

The EP 3 181 944 A1 discloses a vibration isolator used to store semiconductor industry devices. The vibration isolator is included a work space designed as an air spring and has a base part and a head part. The base and head part are connected to a load to be insulated. The air spring consists of an outer housing and an inner housing, both housings being sealed with one another via an elastic membrane. A magnetic actuator consisting of coils and magnets is provided for an insulation effect in the vertical direction. For an insulation effect in the horizontal direction, a bending rod is provided, which is connected to the head part by a screw and to the inner housing by a screw. Furthermore, a pressure in the work area can be regulated via a pneumatic control valve, and the work area can move in the vertical direction due to the elasticity of the membrane.

The German utility model DE 78 17 348 U introduces a rubber-elastic bearing that includes a hollow rubber spring, a plate valve, a mounting flange and metal end walls. The end wall is connected to a motor housing on the motor side and the end wall is arranged facing away from the motor, the end walls being rigidly connected to one another by a centrally provided bolt. Furthermore, two chambers are separated by the plate valve, into which a liquid is filled. The chambers are connected to one another via valve openings of the plate valve.

The GB 2 124 731 A shows an inflatable vibration damper comprising two annular elements. A gas, a liquid or a combination of a gas and a liquid can be filled into the annular elements. A spring of the vibration damper can be replaced by another ring-shaped element or a soft rubber element. The vibration damper can be used for a heavy machine, for example a diesel engine, to dampen the vibrations during operation.

In the EP 0 049 741 A1 an elastic thrust bearing is shown. In the axial bearing, rubber rings with liquid-filled rings are arranged on both sides against a support element.

Furthermore shows the JP S59-175 641 A an engine mount for a drive motor of a vehicle, the engine mount comprising four air springs. In order to reduce oscillations or vibrations of the engine against a body, each air spring is arranged between a mounting of the engine and a mounting of the body 38, the air spring being made of rubber. The air springs are connected on one side to the body and on the other side to the engine to dampen the vibrations of the engine . With air springs of this type, however, oscillations and vibrations of an air compressor cannot be damped against a body alone. Thus, the operation of an air compressor with respect to its support structure / body alone is not disclosed or addressed here.

In the DE 10 2016 224 081 A1 describes an air spring for suspension of a vehicle, the air spring being attached to a body on one side via an air spring cover and to a wheel carrier on the other side via an air spring piston. Furthermore, an air compressor is integrated in the air spring, so that an air bellows of the air spring is connected directly to an air compressor and can be filled directly with the compressed air generated by the air compressor. The air spring with the air bellows is consequently arranged on the wheel. Since the air bellows can be filled directly by the air compressor integrated in the air spring, only vibrations of the wheel are reduced.

The US 5,018,698 A. shows a vibration-isolating holder for a pump, with which the vibrations of the pump occurring during operation can be reduced. Vibrations of an air compressor in relation to a body cannot be reduced in this way.

The JP S59-13 698 A represents a device comprising an air compressor and an air tank, wherein the compressed air generated by the air compressor can be admitted into the air tank. To reduce vibrations of a moving wheel, an air spring is attached to a bottom of the air tank. Accordingly, an air spring for damping a moving wheel is arranged on the body.

Other generic devices are in the US 6 123 325 A , US 4,564,177 A. , JP H06-227 309 A , DE 298 17 737 U1 , US 2015 0 345 490 A1 , JP H08-296 558 A , EP 1 979 177 B1 , EP 0 049 741 A1 , GB 2 124 731A , DE 78 17 348 U1 , DE 10 2006 025 055 A1 and EP 3 181 944 A1 shown.

Starting from the above prior art, it is an object of the invention to propose a mounting device with an air spring for an air compressor of a vehicle, the volume of the air spring being variable by changing the amount of compressed air in the air spring. Different decoupling effects are thus made possible, the operating compressed air being able to be taken from the air compressor itself and simplified spring control being achieved.

This object is achieved by a bearing device for an air compressor of a vehicle according to the independent claim. Advantageous developments of the invention are the subject of the dependent claims.

DISCLOSURE OF THE INVENTION

A bearing device for an air compressor with a body of a vehicle is proposed, by means of which the air compressor is connected to a body of a vehicle in a vibration-isolating manner.

It is proposed according to the invention that the bearing device comprises at least one air spring with an elastic air bellows, the air bellows being connected to a compressed air line of the air compressor for controllable compressed air filling.

In other words, an air spring having an elastic air bellows is proposed, the air bellows preferably being made of rubber or a flexible, flexible material, wherein the rigidity of the bearing device can be changed by the elasticity and the introduced air pressure volume of the air bellows. Vibration-isolating property means that the air bellows has a higher rigidity when unpressurized and therefore has less vibration isolation.

According to the invention it is advantageously achieved that the bearing device consisting of at least one air spring is provided for decoupling the air compressor from the body. The bearing device is arranged between the air compressor and the body. During operation of the air compressor, no noise is generated due to impacts between the air compressor and the limiting elements surrounding the coil springs. In addition, the use of the bearing device, which is connected on one side to the air compressor and on the other side to the body, can reduce the transmission of dynamic forces into the body and thus better decoupling can be achieved.

Furthermore, the air bellows has a connection for connecting to a compressed air line of a mounted air compressor, which preferably provides compressed air for a vehicle suspension. The air bellows can thus be filled and inflated with compressed air via the compressed air line during operation of the air compressor. For this purpose, for example, a valve contained in the compressed air line can be controlled via a control device such as an electronic unit, the valve being controlled in the open position when inflated. Uncontrolled inflation during operation and a depressurized state in the idle state of the air compressor can enable relatively simple adaptive storage.

Alternatively, it is conceivable that the air bellows is connected to a compressed air accumulator of a vehicle suspension system via a compressed air line. The excess compressed air generated by the air compressor is introduced into the compressed air reservoir via another pressure line, so that the compressed air reservoir can be inflated. In order to isolate vibrations, the air bellows can be connected to the compressed air reservoir and thus the compressed air can be directed into the air bellows. To control an inflation process, a valve can be present in the compressed air line connected to the air bellows, the valve being able to be controlled by the control device. The valve can be adjusted between an open position and a closed position as required. As a result, the air bellows can be inflated and blown out in a controllable manner.

It is advantageous that the bearing device can comprise a plurality of air springs, in particular three or more, each air spring each having an elastic air bellows. In particular, the air compressor is connected to the body exclusively by air springs. Different types of position devices with a different number of air springs can be used for different air compressors to reduce the transmission of force when the air compressor vibrates.

In an advantageous further development, the air spring can be formed at least in two stages and preferably comprise an upper plate and a lower plate, the upper plate and the lower plate being respectively arranged on an upper part and lower part of the air bellows. The upper plate and the lower plate can be made of a dimensionally stable, hard material, for example made of metal or plastic, and can in each case be fastened to an upper end face and a lower end face of the air bellows with different connection options, for example by gluing. If the valve arranged on the air bellows is switched off, the air compressor can be lifted out of an elastic seat which is formed from the elastic air bellows. If the valve is switched on, the air bellows can be completely filled with the compressed air, so that the air compressor can be decoupled from the body via the air spring formed. In the depressurized state, the air bellows advantageously has a self-resetting initial shape in which the two plates lie opposite one another and the air bellows material in between provides a reduced decoupling property.

In a further advantageous development, the two-stage air spring can be in a mechanically defined starting position in the idle state. In other words, such a position of the two-stage air spring can be designed as the starting position if there is no air in the air bellows. In this case, the air compressor can be mounted on the elastic material of the air bellows, whereby a mechanical tight fit - at least in a preferred direction vertically between the body and the air compressor - can be achieved between the upper part and the lower part of the air bellows.

In a further advantageous development, in the starting position, the upper plate - due to a self-resetting spring action of the air bellows material - can engage mechanically in a form-fitting manner in the lower plate as soon as the air bellows is depressurized, so that the air compressor moves in a horizontal direction between the air compressor and the body is mechanically fixed and a spring tension is exerted by the air bellows wall in the vertical direction as the preferred direction from the air compressor to the body. In this development, a compressed air line can be provided for connecting the air bellows to the atmosphere via the valve, the compressed air line on one side, ie. h on one side, be connected to the connection of the air bellows and the air bellows on the other side, d. h on the other hand, can be vented to the atmosphere via this compressed air line. Because the upper and lower plates engage in one another and the valve is in the closed position at the same time, the pressureless air bellows can be provided. This can result in a horizontal tight fit of the air bellows, so that in the idle state the bearing of the air compressor is fixed in the horizontal direction between the air compressor and the body and is mounted relatively stiffly. In contrast, a spring tension from the material of the air bellows is provided in the vertical direction from the air compressor to the body. With the spring tension, the air compressor can be stored sufficiently decoupled from the body in the idle state.

In a further advantageous development, the lower plate can have at least one recess and the upper plate has at least one complementary projection, the projection and the recess preferably being formed in the central region of the corresponding plate. The top and bottom plates are used to attach the air compressor to the body. For this purpose, fastening holes can be provided in the edge region of both plates, for example, through which screws or rivets for fastening the upper plate and lower plate can be guided accordingly on the air compressor and the body. Advantageously, the projection can be complementary to the inner profile of the recess, so that the upper plate can be inserted into the lower plate in a mechanically fixed manner. When inserted, the inner surface portion of the air bladder with respect to the protrusion of the upper plate can contact the inner surface portion of the air bladder with respect to the recess of the lower plate. As a result, the air spring can be in a mechanically fixed starting position.

In a further advantageous development, a resilient mounting can be formed both in the horizontal direction and in the vertical direction in the operating state by pressurizing the air bellows. When the air compressor is operating, the valve can be controlled by the control device and be in the open position, so that the compressed air compressed by the air compressor can be guided through the compressed air line to the air bellows. The more compressed air there is in the air bellows, the greater the spring tension that can be provided by the air spring. Advantageously, a complete storage of the air bellows enables a soft bearing to be achieved, which is formed both in the horizontal direction and in the vertical direction, so that undesired vibrations or structure-borne noise can be optimally reduced by operating the air compressor. An increase in the air pressure can lead to an increase in the spring stiffness and a decrease in the air pressure to a decrease in the spring stiffness, so that different stiffness values can be achieved on the basis of the air pressure.

In a further advantageous embodiment, a controllable bearing directional control valve can be connected to the two-stage air spring. Advantageously, a 3/2-way valve can be arranged as a storage directional control valve, so that the storage directional control valve can be switched to different switching positions for pressurization, pressure relief and pressure locking. The storage directional control valve can be arranged on the air bellows via a connecting line, the compressed air being able to be provided either by the air compressor or by the compressed air reservoir via the pressure line. This provides a stepless regulation of the rigidity.

In an advantageous embodiment, the controllable bearing directional control valve can activate the air spring before activating the air compressor. A hysteresis over time can thereby be formed, wherein the activation of the air bearing or the activation of the air compressor can be achieved before switching on and a deflation of the air spring after switching off the air compressor in order to suppress start-up and discharge noises of the air compressor. This means that the air compressor can be stored in air before the air compressor starts. Suppression of working noises can be ensured in a particularly advantageous manner since different types of starting noises of the air compressor can also be compensated for.

In an advantageous embodiment, a control unit can be set up to draw compressed air from a compressed air reservoir for activating the air spring before activation of the air compressor and to actuate the controllable storage directional control valve upstream and / or afterwards, in particular to release the air spring afterwards. This also enables the air storage of the air compressor to be activated by the compressed air reservoir before the air compressor starts. The compressed air reservoir can, for example, be an additional compressed air tank or an already existing compressed air tank. By activating and / or deactivating the storage directional control valve in advance, acoustic decoupling from the body and suppression of working noises of the air compressor can take place particularly advantageously. By deactivating the storage directional control valve at a later time, the air springs can come to a rest position with a delay when the air compressor is switched off, as a result of which, for example, the noise from the air compressor can be compensated.

In an advantageous embodiment, compressed air from a compressed air reservoir, in particular from a compressed air line of the vehicle, from an air spring for a wheel, from a compressed air connection system of the vehicle, from a compressed air reservoir and / or from an additional compressed air reservoir, can be supplied to the air spring by the controllable bearing directional control valve . The compressed air can therefore be obtained from different air sources. The compressed air feeds to the air compressor can preferably be switched off or blocked at the time at which compressed air is supplied to the air spring as described above. Additional valves can be provided for this.

For example, the air spring can be filled with compressed air for 1-10 seconds, in particular 2-5 seconds, before the air compressor is activated, or depressurized after the air compressor has been switched off. The periods just described can also be less than 1 second.

In a further advantageous development, the bearing directional control valve can be electrically controllable. The bearing directional control valve is also referred to as an electrically operated valve. The storage directional control valve can be connected to an electrical connection of the control device. By means of an electrical voltage that is output by the control device, the bearing directional control valve can be actuated in such a way that an electromagnet as an actuating element can be actuated with the electrical voltage and the switching of the valve can thus be initiated. It is advantageous that the storage directional control valve can be controlled electrically and no complicated mechanical connection or extensive pneumatic pilot controls are provided to actuate the storage directional control valve. Furthermore, the use of an electrically operated valve can lead to a significantly easier installation at lower costs.

In a further advantageous development, the bearing directional control valve can be controlled pneumatically. The storage valve is called a pneumatic valve. In comparison to the previous development, a connection for the compressed air is provided instead of an electrical connection, and the bearing directional control valve can be switched by means of a control compressed air of the air pressure system. A pneumatic valve enables a low cost and there is no need for additional electrical components that are at risk of failure.

In a further advantageous development, the storage directional control valve can have two connections, a first connection being connected to the compressed air outlet of the air compressor or to a compressed air outlet of a compressed air store, a second connection being connected to the atmosphere via an outlet line. For this purpose, a first switching position and a second switching position are provided. If the storage valve is switched to the first switching position, the air bellows can be filled with the compressed air generated directly by the air compressor or the compressed air received in the compressed air reservoir depending on the connection, so that the air spring can be in the operating state. If the storage valve is switched to the second switching position, the compressed air in the air bellows can be blown out to the atmosphere via the outlet line, so that the air spring can be in the idle state. This enables simple pressure control of an adjustable spring stiffness.

In a further advantageous embodiment, a vibration sensor can be arranged on the compressor for monitoring the vibration of the air compressor, wherein a variable amount of the compressed air guided into the air bellows can be regulated via the bearing directional control valve according to the vibration intensity of the air compressor. The vibration sensor can be connected to an electrical connection of the control device, wherein the vibration sensor can detect the vibration intensity of the air compressor and can generate a vibration signal responsive to it. The vibration signal is sent to the control device and thus the control device controls the storage directional control valve in order to switch the storage directional control valve to an open position or a closed position. Advantageously, the amount of compressed air in the air bellows can be changed according to the vibration level of the air compressor and, if necessary, correlated with it via a characteristic curve. The vibration sensor can be used to provide an adaptive suspension property of the bearing device, in particular one or more adapted air springs for different vibration levels of the air compressor, so that an improved decoupling of the air compressor is made possible.

Following the previous exemplary embodiment, in a further advantageous development with a high vibration level of the air compressor, compressed air adapted for this can be introduced into the air bellows. This does not necessarily have to be a maximum compressed air strength, but can e.g. based on the characteristic curve, a quantity of compressed air that provides optimum spring stiffness for decoupling. In this way, an optimal decoupling of the air compressor can be achieved.

In a further advantageous embodiment, a pressure sensor for detecting the air pressure in the air bellows and for generating a pressure signal responsive thereto can be included, the pressure sensor being arranged at the inlet of the air bellows. The pressure sensor can be arranged in the connection channel between the air spring and the bearing directional control valve in order to detect the air pressure at a compressed air inlet or compressed air outlet of the air bellows. The pressure sensor can pass on its signal to a connection of the control device, so that the pressure signal is transmitted to the control device and the storage directional control valve can hereby be controlled adaptively by the control device.

A pressure sensor is advantageously arranged on the compressed air inlet of the air bellows and a vibration sensor on the air compressor. An error message can be output with the two sensors, whereby even with adjusted air pressure in the air bellows, e.g. to suppress resonance, the air compressor vibrates unexpectedly strongly. This means that if an unexpected vibration occurs, an error can be determined by the two sensors in combination.

Following the previous exemplary embodiment, in a further advantageous development, by measuring the air pressure in the air bellows, a quantity of the compressed air in the air bellows can be changed in a controllable manner via the storage directional valve. The pressure sensor can detect the air pressure in the air bellows in real time; the amount of compressed air can hereby be changed according to the pressure strength via the bearing directional control valve, which can be controlled by the control device. The air compressor can thus be optimally decoupled during operation.

In a secondary aspect, an air compressor of a vehicle is proposed, which is connected to a body of a vehicle in a vibration-isolating manner by means of a bearing device as described above. The air compressor according to the invention comprises a bearing device according to one of the aforementioned exemplary embodiments. Such a bearing device can also be used advantageously as a spare part for replacing or further developing an air compressor.

DRAWINGS

Further advantages result from the present description of the drawings. Exemplary embodiments of the invention are shown in the drawings. The drawings, description, and claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into useful further combinations.

Fig. 1

eine schematische Darstellung einer Druckluftversorgungsvorrichtung mit einer Lagervorrichtung gemäß dem Stand der Technik;

Fig. 2

eine schematische Darstellung einer Druckluftversorgungsvorrichtung mit einer ersten Ausführungsform einer Lagervorrichtung gemäß der Erfindung;

Fig. 3

Seitenansicht der in Fig. 2 im Ruhezustand dargestellten Lagervorrichtung;

Fig. 4

Seitenansicht der in Fig. 2 im Betriebszustand dargestellten Lagervorrichtung;

Fig. 5

eine schematische Darstellung einer Druckluftversorgungsvorrichtung mit einer zweiten Ausführungsform einer Lagervorrichtung der Erfindung;

Fig. 6

eine schematische Darstellung einer Druckluftversorgungsvorrichtung mit einer dritten Ausführungsform einer Lagervorrichtung der Erfindung.

Show it:

Fig. 1

is a schematic representation of a compressed air supply device with a storage device according to the prior art;

Fig. 2

is a schematic representation of a compressed air supply device with a first embodiment of a storage device according to the invention;

Fig. 3

Side view of the in Fig. 2 bearing device shown in the idle state;

Fig. 4

Side view of the in Fig. 2 bearing device shown in the operating state;

Fig. 5

is a schematic representation of a compressed air supply device with a second embodiment of a storage device of the invention;

Fig. 6

is a schematic representation of a compressed air supply device with a third embodiment of a storage device of the invention.

In the figures, elements of the same type are numbered with the same reference numerals. The figures only show examples and are not to be understood as limiting.

In Fig. 1 schematically shows a compressed air supply device 10 with a bearing device known from the prior art, which consists of three spiral springs 46, of which only two are visible in the illustration. The compressed air supply device 10 has an air compressor 20 which comprises a motor-operated air pressure cylinder, preferably a two-stage air pressure cylinder, which is connected to a feed line 11 on the intake side. A check valve 18 is provided in the feed line 11, which opens in the suction direction and towards the air compressor 20 and closes in opposite directions by means of spring loading. An air dryer 24 is arranged in a pressure line 12 with the pressure side of the air compressor 20.

Between the air compressor 20 and the air dryer 24 branches off a further pressure line 12, in which a 2/2-way valve 26 is arranged as the first directional valve 26, a 3/2-way valve 30 as the second way valve 30 via a pressure line 12 with a pneumatic Control input 28 of the first directional valve 26 is connected. When the second directional valve is in a switching state, the pneumatic control input 28 of the first directional valve 26 is connected to the atmosphere by the second directional valve 30 via a connecting line 32.

Furthermore, each air spring for a wheel 40 of a vehicle is connected to a pressure line 12, in which a 2/2-way valve 38 is arranged as a third directional valve 38, the control input of which is connected to a control device 16 via a control line 14. The suspension characteristic of the vehicle wheel can be set via the control line 14.

A compressed air reservoir 36 is switched on in a pressure line 12, a 2/2-way valve 34 being arranged as a changeover valve 34 at the compressed air inlet of the compressed air reservoir 36.

By means of the spiral springs 46, which represent a bearing device of the prior art, a housing 42 comprising the air compressor 20 can be connected to a body 44 of a vehicle. The spiral springs 46 are intended to achieve mechanical decoupling of the body, so that vibrations occurring during operation are passed on to the body in a reduced manner. Adjusting the spring characteristics is not possible.

In Fig. 2 a compressed air supply device 10 according to a first embodiment of a bearing device 76 according to the invention is shown schematically.

Different from the Fig. 1 For example, a housing 42 comprising an air compressor 20 can be connected to a body 44 of a vehicle by the bearing device 76, the bearing device 76 being connected via a pressure line 12 to a 3/2-way valve 50 as a bearing directional valve 50. Compressed air can be introduced or removed into the pneumatically operated bearing device 76 via the storage directional control valve 50, so that a spring characteristic of the bearing device 76 can be set depending on the operating state of the air compressor 20. The storage directional control valve 50 has a first connection 68 and a second connection 70. Compressed air can be blown out of the bearing device 76 to the atmosphere via an outlet line 66.

Furthermore, it is possible, for example, to supply compressed air to the air spring 48 before the air compressor 20 is activated. This compressed air can be supplied, for example, from the pressure line 12, from the compressed air reservoir 36 and / or from the air spring 40 for a wheel of the air spring 48. While compressed air is supplied to the air spring 48 from at least one of the compressed air sources 12, 36 or 40, the connections of the air spring 48 to the other compressed air sources 12, 36 or 40 can be switched off. For this purpose, for example, further valves can be provided in the system. It is still conceivable to do more Feed compressed air from an additional compressed air reservoir, for example an additional, rechargeable compressed air cartridge (not shown) to the air spring 48. The control of the supply of compressed air into the air spring 48 before the activation of the air compressor 20 or the control of the discharge of compressed air after the deactivation of the air compressor 20 can be carried out by a control unit (not shown).

A motor-operated air pressure cylinder of the air compressor 12 is connected to a feed line 11 on the intake side. A check valve 18 is provided in front of the air compressor 20. An air dryer 24 is arranged in the pressure line 12 with the pressure side of the air compressor 20. Between the air compressor 20 and the air dryer 24, a 2/2-way valve 26 is provided as the first directional valve 26 in a branch, a 3/2-way valve 30 as the second directional valve 30 via a pressure line 12 to a pneumatic control input 28 of the first directional valve 26 connected. The compressed air generated by the compressed air supply device 10 can be fed via a pressure line 12 into four air springs for wheels 40, each air spring 40 being connected to a 2/2-way valve 38, the control input of which is connected to a control device 16 via a control line 14. Furthermore, a compressed air reservoir 36 is provided in a pressure line 12, a 2/2-way valve 34 being arranged as a changeover valve 34 at the compressed air inlet of the compressed air reservoir 36.

In 3 and 4 is a side view of the in Fig. 2 bearing device 76 shown in detail accordingly in the idle state ( Fig. 3 ) and in the operating state ( Fig. 4 ) shown. The bearing device 76 comprises an upper plate 60 and a lower plate 62 and an air spring 48 with an air bellows 58, the upper plate 60 having a projection 74 and the lower plate 62 having a shape-complementary recess 64. An upper part 54 of the bearing device 76 and a lower part 56 of the bearing device 76 can correspondingly be connected to the air compressor 20 and the body 44. A decoupling of the air compressor 20 can be achieved by the bearing device 76 both in the idle state and in the operating state.

Like in the Fig. 3 shown, the bearing device 76 is in the idle state, in which the upper plate 50 engages in a mechanically positive manner in a damping direction vertically between the body 44 and the air compressor 20 in the lower plate 62. This can result in a horizontal tight fit of the air compressor 20 in the idle state, and in the vertical direction a rigid mounting of the air compressor 20 is brought about by a self-elastic property of the unpressurized air bellows 58.

Fig. 4 represents the bearing device 76 in the operating state, wherein compressed air can be introduced into the air spring 48 or the air bellows 58 via the recess 64, so that an effective decoupling of the air compressor 20 from the body 44 can be achieved via the air spring 48.

Fig. 5 schematically shows a compressed air supply device 10 with a second embodiment of a bearing device 76, through which a housing 42 of an air compressor 20 can be connected to a body 44.

An air compressor 20, an air dryer 24, a 2/2-way valve 26 as a first directional valve 26 and a 3/2-way valve 30 as a second directional valve 30 are arranged in the housing 42, the second directional valve 30 via a pressure line 12 to a pneumatic control input 28 of the first directional valve 26 is connected. A check valve 18 is provided in front of the air compressor 20. The compressed air generated by the air compressor 20 can be fed into four air springs for wheels 40, wherein a quantity of the compressed air in each air spring for wheel 40 can be controlled by a 2/2-way valve 38 which is designed as a third directional valve 38. A control input of the third directional valve 38 is connected to a control device 16 via a control line 14. Furthermore, a compressed air reservoir 36 is provided in a pressure line 12, a 2/2-way valve 34 being arranged as a changeover valve 34 at the compressed air inlet of the compressed air reservoir 36.

Different from the Fig. 2 the bearing device 76 is connected to the compressed air outlet of the compressed air reservoir 36, a 3/2-way valve serving as a bearing directional valve 50 between the bearing device 76 and the compressed air reservoir 36 is used, which has a first connection 68 and a second connection 70. The compressed air can be blown out of the bearing device 76 to the atmosphere via an outlet line 66. In order to detect a vibration level of the air compressor 20, a vibration sensor 52 is arranged on the housing 42, the vibration sensor 52 being connected to the control device 16, so that vibration signals can be transmitted to the control device 16. On the basis of the vibration, an air pressure can be set via the bearing directional valve 50 in the bearing device 76 to control the damper characteristic. An optimized decoupling of the body 44 and the air compressor 20 can thus be achieved adaptively depending on the respective vibration state.

The Fig. 6 illustrates schematically a compressed air supply device 10 with a third embodiment of a bearing device 76. An air compressor 20 is arranged in a housing 42. An air dryer 24 is provided with the pressure side of the air compressor 20 in a pressure line 12. A check valve 17 is arranged in front of the air compressor 20. The output side of the air compressor 20 is connected to a 2/2-way valve 26, a second 3/2-way valve 30 being connected to a pneumatic control input 28 of the 2/2-way valve 26. Furthermore, the compressed air can be fed via a pressure line 12 into four air springs for wheels 40, whereby a quantity of the compressed air in the air springs for wheels 40 can be changed by a 2/2-way valve 38. A control input of the 2/2-way valve 38 is connected to a control device 16 via a control line 14. The bearing device 76 is connected to the air compressor 20 via a pressure line 12, so that the compressed air can be provided by the air compressor 20 for the bearing device 76. A 3/2-way valve 50 can be used to regulate a variable amount of compressed air in the bearing device 76, which is designed as a bearing directional valve 50.

Different from the Fig. 5 not only a vibration sensor 52 but also a pressure sensor 72 are provided for the bearing device 76. The pressure sensor 72 is set up to increase the pressure prevailing in the air bellows 58 determine. For this purpose, the vibration sensor 52 is arranged on the housing 42 and the pressure sensor 72 at the compressed air inlet of the bearing device 76 in order to monitor on the one hand a vibration level of the air compressor 20 and on the other hand an air pressure in the bearing device 76. For example, an error message can be output with the two sensors if an unexpected vibration occurs. The sensor signals of both sensors 52, 72 can be used to improve the position control of the air compressor 20 relative to the body 44. For this purpose, the two sensors 52, 72 are connected to the control device 16, so that vibration signals and pressure signals of the control device 16 can be monitored in order to optimize the damping stiffness of the bearing device 76 and to be able to carry out an error monitoring.

Reference symbol list

10th

Compressed air supply device

11

Supply

12th

Pressure line

14

Control line

16

Control device

18th

check valve

20th

Air compressor

24th

Air dryer

26

2/2-way valve, first directional valve

28

Pneumatic control input

30th

3/2-way valve, second directional valve

32

Connecting cable

34

2/2-way valve, changeover valve

36

Compressed air reservoir

38

2/2-way valve, third way valve

40

Air spring for one wheel

42

casing

44

body

46

Coil spring

48

Air spring

50

3/2-way valve, storage directional valve

52

Vibration sensor

54

Top

56

Lower part

58

Air bellows

60

Upper plate

62

Lower plate

64

Recess

66

Output line

68

First connection

70

Second connection

72

Pressure sensor

74

head Start

76

Storage device

Claims (18)

Bearing device (76) for an air compressor (20) of a vehicle, through which the air compressor (20) is connected in a vibration-isolating manner to a body (44) of a vehicle, characterized in that the bearing device (76) has at least one air spring (48) with an elastic Air bellows (58), the bearing device (76) being arranged between the air compressor (20) and the body (44) and the air bellows (58) being connected to a compressed air line of the air compressor (20) for filling compressed air. Bearing device (76) according to claim 1, characterized in that the air spring (58) is at least two-stage, and preferably comprises an upper plate (60) and a lower plate (62), the upper plate (60) and the lower plate (62) is respectively arranged on an upper part (54) and lower part (56) of the air bellows (58). Bearing device (76) according to claim 1 or 2, characterized in that the two-stage air spring (48) is in the idle state in a mechanically fixed starting position. Bearing device (76) according to claim 3, characterized in that in the starting position, the upper plate (60) engages mechanically positively in the lower plate (62), the air bellows (58) being depressurized, so that in a horizontal direction between the air compressor and the body a movement of the air compressor (20) is mechanically fixed and a spring tension is exerted by the air bellows (58) in the vertical direction from the air compressor to the body. Bearing device (76) according to claim 4, characterized in that the lower plate (62) has at least one recess (64) and the upper plate (60) has at least one complementary projection (74), preferably the projection (74) and the recess (64) are formed in the central area of the corresponding plate (60, 62). Bearing device (76) according to claim 1, characterized in that in the operating state, a resilient bearing is formed both in the horizontal direction and in the vertical direction by pressurizing the air bellows (58). Bearing device (76) according to claim 1, characterized in that a controllable bearing directional control valve (50) is connected to the two-stage air spring (48). Bearing device (76) according to claim 7, characterized in that the controllable bearing directional control valve (50) activates the air spring (48) before the activation of the air compressor (20). Bearing device (76) according to claim 7 or 8, characterized in that a control unit is set up to draw compressed air from a compressed air reservoir for activation of the air spring (48) before activation of the air compressor (20) and to control the controllable bearing directional control valve (50) in advance and / or to operate later. Bearing device (76) according to one of claims 7 to 9, characterized in that the controllable bearing directional control valve (50) pressurizes air from a compressed air reservoir, in particular from a compressed air line (12) of the vehicle, from an air spring (40) for a wheel, from a Compressed air connection system of the vehicle, from a compressed air reservoir (36) of the vehicle and / or from an additional compressed air reservoir, the air spring (48) is supplied. Bearing device (76) according to one of claims 7 to 10, characterized in that the bearing directional control valve (50) is electrically controllable. Bearing device (76) according to one of claims 7 to 10, characterized in that the bearing directional control valve (50) is pneumatically controllable. Bearing device (76) according to one of claims 7 to 12, characterized in that the bearing directional control valve (50) has two connections, a first connection (68) being connected to the compressed air outlet of the air compressor (20) or to a compressed air outlet of a compressed air reservoir (36) , a second connection (70) being connected to the atmosphere via an output line (66). Bearing device (76) according to claim 1 and 7, characterized in that a vibration sensor (52) on the compressor (20) for monitoring vibration of the air compressor (20) is arranged, wherein a variable amount of the compressed air fed into the air bellows (58) can be regulated according to the vibration level of the air compressor (20) via the bearing directional control valve (50). Bearing device (76) according to claim 14, characterized in that with high vibration strength of the air compressor (20) more compressed air can be introduced into the air bellows (58). Bearing device (76) according to claim 1, characterized in that a pressure sensor (72) for detecting the air pressure in the air bellows (58) and for generating a responsive pressure signal is included, the pressure sensor (72) being arranged at the inlet of the air bellows (58) is. Bearing device (76) according to claim 16, characterized in that by measuring the air pressure in the air bellows (58), a quantity of the compressed air in the air bellows (58) is controllably changed via the bearing directional control valve (50). Air compressor (20) of a vehicle, which is connected to a body (44) of a vehicle in a vibration-isolating manner via a bearing device (76), characterized in that the bearing device (76) is designed according to one of Claims 1 to 14.

Images